Nozzle



JOHN v.v

Patented Nov. 147, 192.5.

.UNITED STATES somma, or CHICAGO, ILLINOIS, AssIGNoR To CEMENT GUNCONSTRUC- TION CO., F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

Nozzma.

Applicationmea February 1o, 1923. serial No. 618,2'10.

To all whom it may concern:

Be it known'that I, JOI-IN V. SCHARFE, a

citizen of the United States, residing at cially adaptable Chicago, inthe county of Cook and State of gIllinois, have invented certain new andusecement gun, such as that disclosed in United States Letters PatentNo. 991,814, granted to Carl E. Akeley, May 9, 1911, in the use of whichsand and cement are mixed together and with water, at the time when theyare projected from the end of the nozzle into the atmosphere and duringthe time when they are moving thru the atmosphere and at the point ofapplication. In the'present invention I provide meanswithin the nozzleto effectuate the mixingy operation by causing the comminuted materialto deviate from its normal axial course by taking lgenerally resultantlateral Apaths, on either side of the axis of the flowing stream and tocausel alternate, acceleration and retardation of the stre-am 1n ltspassage thru the nozzle, to cooperatively more' thoroughly interminglethe particles of colnminuted material and-to expose every particlethereof to more intimate contact with the4 associated water.

' Another object of the .invention is to provide an improved nozzleconsisting of a plurality of cone-like hollow sections with like ends ofadjacent sections connected together Dthereby forming alternatelycontracted and expanded openings and terminating with a contracted end,said sections arranged to be conveniently. separated for purpose ofclean- Other objects and advantages will readily appear from aconsideration of the specification when a taken in conjunction with thedrawings forming a part hereof, wherein Fig. 1 shows an axiallongitudinal central section. f

Fig.'2 is a transverse section taken on line 2-2 of Fig. 1. i"

In both views the same reference characters indicate correspondingparts.

The mventlon contemplates the use of a,

plurality of tapered sections, some of which for use with a so-.ca-lledare readily separable by, preferably, threaded connection and the nozzleterminating, preferably, for the purpose described, yin a contracted endso -that a stream projected therefrom, will iow at relatively highveloc-V ity or at a velocity higher than it is flowing when it isintroduced into the nozzle.

In the drawing is a threaded fitting into which a two-section member 6is secured by threaded connection, at 7 The member 6 consists in interal formation of two sec-- tions 8 and 9, jomed at their smaller ends at10 to which point they converge, atl their smallest diameters, theirlarger diameters being at'their Outer terminal ends, respec tively.

Section 9 is connected by threaded means to anothertapered sectionf 11,at 12, with opening at 14;, about eight times the area of I s theopening at 15 and the area at 14 is about four times that of the openingat 16. This has given very good results.

The relative speed of the stream passing lthru the nozzle will be variedas it passes the points where the changes in, area occur, and theseconditions uniformly prevail throughout the entire nozzle.

The more lponderable material carried in the stream will be bombardedfrom one side to the other owing to the converging walls, thus causingthorough mixing conditions.

rl `he,iitting 5 contains a 'ring 17 having forwardly projecting, spacedopenings 18 communicating with an annular opening 19 into which waterunder pressure is admitted thru the threaded opening 2() which is to beconnected by a pipe or hose to a. suitable source of water supply. Y

When the nozzle is to convey comminuted abrasive' material such as sand,granular stone, granite, those sections of the nozzle in which thestream approaches'its smaller end as sections 8 and 11 with linings 21and 22, respectively. These linings mav have integral flanges 23 and`24:, respectively,

The fitting 5 is provided with a threaded 11 or the like, it is well toline which serve as packing rings -in the joints between thev able.`

opening by which to connect the nozzle to a hose or conduit for thematerial to he mixedvwithin the nozzle.

It is quite important to. have the nozzle sections of proper taper,especially the outwardly Haring section 9. If the angleof taper ofsection 9 be very much greater than the natural expansion of the stream,or as shown in the drawing, there will be accumulation of material insection 9, near the smaller end v16, from time to time, owing to atendency to the formation of a vacuum at this point by the smallerflowing stream. The result is that this mass of accumulated mortar willbe intermittently discharged from the end of the nozzle. producing aneffect known as spitting which interrupts the uniform operation of thedevice and is very undesirable. If the angle be much less than fivedegrees, as shown, or less than the natural expansion of the stream,then the abrasive elect of the sand will be destructive to themetal-part of the section. This latter effect may, to an extent, heeliminated .by lining section 9 with a soft rubber liner, similar to theliners 21 and 22.

The liners, however, interpose more' resistance to the flowingstream`than desir- In sections- 8 and 11 wherein the streani is causedto be contracted they are practically necessary, as they serve asresilient surfaces to cause rebound of the more material components ofthe stream and assist greatly in the mixing operation.

When section 94conforms to an angley of about tive degrees, withyrespect to its axis,

thestream will move in lines substantially' sections, each sectionhaving a uniformly l tapered bore, with alternate sections tapered inthe samefdirection and arranged to contract and alternately expand astream flowing therethrough; relatively soft linings for \saidconverging sections and a screw joint at each larger end of saidcontracted sections adapted for connection with another section.

In testimony whereof I hereunto subscribe my name. A A

JOHN v. SCHAEFER.

